Update prereqs for webhooks (#4422)

## What are you changing in this pull request and why?

Updating the prereqs for webhooks

## Checklist
- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
and [About
versioning](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/single-sourcing-content.md#adding-a-new-version)
so my content adheres to these guidelines.
- [x] Needs review from PM

website/docs/docs/deploy/webhooks.md

@@ -31,7 +31,7 @@ You can also check out the free [dbt Fundamentals course](https://courses.getdbt
 - For `write` access to webhooks: 
     - **Enterprise plan accounts** — Permission sets are the same for both API service tokens and the dbt Cloud UI. You, or the API service token, must have the [Account Admin](/docs/cloud/manage-access/enterprise-permissions#account-admin), [Admin](/docs/cloud/manage-access/enterprise-permissions#admin), or [Developer](/docs/cloud/manage-access/enterprise-permissions#developer) permission set.  
     - **Team plan accounts** — For the dbt Cloud UI, you need to have a [Developer license](/docs/cloud/manage-access/self-service-permissions). For API service tokens, you must assign the service token to have the [Account Admin or Member](/docs/dbt-cloud-apis/service-tokens#team-plans-using-service-account-tokens) permission set. 
-- You have a multi-tenant deployment model in dbt Cloud. For more information, refer to [Tenancy](/docs/cloud/about-cloud/tenancy). 
+- You have a multi-tenant or an AWS single-tenant deployment model in dbt Cloud. For more information, refer to [Tenancy](/docs/cloud/about-cloud/tenancy). 
 
 ## Create a webhook subscription {#create-a-webhook-subscription}